Mark who told you that Hydramaster dont have oil shut downs,
Ive used every Hydramaster TM out there apart from new turbo equiped Max as theres only 1 in this contry at the moment I belive, But have seen it and quite envious, But will have to say the new range (Boxers/ Maxs) are bullet proof the build quality is such that you would expect from Ferrari compared to woodbridge which must be like a ford focus, but ive never owned a woodbridge or a focus but have seen them both, The extra money for the Hydramster's is well spent if you ask me (well I would say that as I own one) with the new cluch system on pump, alloy frames, heat diverters and new couplings they are a diffrent leauge even compared to the old 3.2 and 4.0 spitfires.
The new look woodbridges (or hurcules / panther) look better though, not so rabit hutch looking any more